I've seen photos of supposedly Japanese-made Ming swords with the tangs exposed, and their tangs look like typical Chinese tangs. So either (a) their identification as Japanese was incorrect, or (b) the Japanese made Chinese-style tangs for export blades, or (c) the tangs were locally modified.
I'd just add that sanmei/three-plate and inserted-edge construction were used in Japan. AFAIK, kobuse (hard skin, soft core) lamination became dominant in the Edo Period, and sanmei/sanmai was the most common before that.
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